Detailed explanation of JavaScript filter keyword examples-JS Tutorial-php.cn

Detailed explanation of JavaScript filter keyword examples

怪我咯

Release： 2017-07-07 10:34:04

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This article mainly introduces the JavaScript method of filtering keywords. Has very good reference value. Let’s take a look at it with the editor below

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Without further ado, please look at the code ：

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>Title</title>
 <style>
 em { font-size: 16px; color: red; }
 </style>
</head>
<body>
 <p id="cont">JavaScript过滤关键字的方法JavaScript过滤关键字的方法</p>
 <script>
 //================================= 可用状态代码 =====================================
// var arr = [&#39;Java&#39;,&#39;关键字&#39;, &#39;方法&#39;],
// arrText = arr.join(&#39;|&#39;),
// var params = document.querySelector(&#39;#cont&#39;);
//
// // 替换关键字
// params.innerHTML = params.innerHTML.replace(new RegExp(arrText, "ig"), "<em>$&</em>");
// var arr = [];
// console.log(arr);

//================================= 修改后的代码 =====================================
 /**
 * 过滤关键字
 * @param keyArr 需要过滤的关键字数组
 * @param ele 过滤的节点
 */
 function filterContent(keyArr, ele) {
 /**
 * 一个程序的标准准则
 * 1. 可用, 可以实现核心的需求
 * 2. 健壮, 兼容性处理, 边界处理, 异常处理, 用户输入校验
 * 3. 可靠, 任何时候都要有返回值
 * 4. 宽容, 对需求宽容, 对调用着宽容, 对维护者宽容
 * 5. 精益求精, 可靠的注释...
 */
 try {
 // 检测是否为 undefined 或者为一个数组，或者数组长度是否大于 1, 这里的返回 -1 只是为了有返回值, 也可以不写
 if (keyArr === &#39;undefined&#39; || !(keyArr instanceof Array) || keyArr.length < 1) return -1;
 // 将数组里面的元素以 | 进行合并方便进行正则比较, 如 张三|李四
 var arrTxt = keyArr.join(&#39;|&#39;),
  regObj = new RegExp(arrTxt, &#39;ig&#39;);
 // 替换关键字
 ele.innerHTML = ele.innerHTML.replace(regObj, "<em>$&</em>");
 } catch (e) {
 console.log(&#39;出错啦~&#39; + e);
 }

 }
 // 调用
 var arr = [&#39;Java&#39;,&#39;关键字&#39;, &#39;方法&#39;];
 var params = document.querySelector(&#39;#cont&#39;);
 filterContent(arr, params);
 </script>
</body>
</html>

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